wsn terminal node and its low power interception method based on zigbee

Abstract

The invention discloses a WSN (Wireless Sensor Network) terminal node and a ZigBee-based low-power-consumption intercepting method of the WSN terminal node, wherein the method comprises the following steps of: after turning into a timed wake-up period from a dormancy period, carrying out the space-frequency defection of the terminal node; if a wake-up device matched with the node is not detected, closing a radio-frequency module per se and turning into the dormancy period; if the wake-up device matched with the node is detected, detecting whether an active alarm issued by upper-layer equipment exists or not; if the active alarm exists, carrying out state storage and giving an alarm, and then judging whether a local alarm needs to be uploaded or not according to a local rule; if the active alarm does not exist, directly judging whether the local alarm needs to be uploaded or not according to the local rule; if the local alarm needs to be uploaded, then returning to the local alarm; if the local alarm does not need to be uploaded, then periodically returning data of the node according to the rule; and sending the local alarm or the data of the node to the wake-up device through the radio-frequency module, and then closing the radio-frequency module of the node and turning into the dormancy period. The method has low power consumption, and meanwhile, reliable intercommunication is ensured.

Description

technical field [0001] The present invention relates to a wireless sensor network (Wireless sensor network, WSN) technology, in particular to a WSN terminal node and its ZigBee-based low-power interception method. Background technique [0002] Low power consumption has always been an important characteristic of wireless sensor networks. Since the terminal nodes of the wireless sensor network are generally powered by batteries, in order to ensure the working time, it is often necessary to turn off the energy-consuming module of the terminal node for wireless data transmission and reception to reduce the operating power consumption. [0003] In order to solve the energy consumption problem of terminal nodes in wireless sensor networks, a lot of energy has been put into research (including improvements of MAC protocol and routing protocol) all over the world. At the same time, with the development of chip technology, the power consumption of the chip is also continuously reduc...

AI Technical Summary

Problems solved by technology

However, due to the mobility of the terminal node, the address sent last time may be sent unsuccessfully due to mobile transformation according to the routing information.

Who to send to when the terminal node wakes up becomes the bottleneck of this working mode; simple broadcast transmission often easily leads to unreliable communication; and if a connection needs to be established after each wake-up to ensure the reliability of communication, the cost of establishing a connection It is much higher than the cost of sending and collecting information. Sending data once may require multiple transmissions between terminal nodes to complete the establishment of the connection, which will consume more energy of the terminal nodes.

At the same time, using the broadcast method in establishing a connection is likely to cause channel occupation conflicts

In addition, in this method, usually the upper-layer device can only passively receive the status data or alarm data sent by the terminal node, and the upper-layer device cannot actively alert the terminal node to dangerous situations such as the environment

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